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In case of multipofile mode, when account picker is invoked a blank
white screen appears. Though it is not entirely clear why it happens,
but removing 'full-screen-dialog' attribute from the oobe-dialogs in
checking_downloading_update polymer element apparently fixes it. This
leads to another problem of the update_screen not shown in full screen
mode. For that we need to call onBeforeShow() of the polymer element
explicitly so that the oobe_dialog_host_behavior in the
checking_downlaoding_update can be used to set full screen mode for
all the oobe dialogs.

Bug: 1061330
Change-Id: Ic51082b0694f4bed0f357ec7616ab2fbc108fcb5
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2105316Reviewed-by: Denis Kuznetsov [CET] <antrim@chromium.org>
Reviewed-by: Roman Sorokin [CET] <rsorokin@chromium.org>
Commit-Queue: Saurabh Nijhara <snijhara@google.com>
Cr-Commit-Position: refs/heads/master@{#750905}